Hi everyone!

My baby started to grow her first tooth when she was about 9 months. At 10months, she now has 4 teeth. However, I've noticed that my baby's upper tooth has a bit of discoloration, which made me want to start brushing her teeth. But what may have caused this slight yellowish discoloration? And I have a bit of a dilemma which is best to use - should I use toothbrush with bristles or a rubber toothbrush for her teeth? And is it already safe to brush her teeth with toothpaste? What toothpaste can you recommend?

I'm very eager to hear your thoughts/opinions on this.
Thank you!